TY - JOUR
T1 - Shift-invariant multilinear decomposition of neuroimaging data
AU - Mørup, Morten
AU - Hansen, Lars Kai
AU - Arnfred, Sidse Marie
AU - Lim, Lek-Heng
AU - Madsen, Kristoffer Hougaard
PY - 2008/10/1
Y1 - 2008/10/1
N2 - We present an algorithm for multilinear decomposition that allows for arbitrary shifts along one modality. The method is applied to neural activity arranged in the three modalities space, time, and trial. Thus, the algorithm models neural activity as a linear superposition of components with a fixed time course that may vary across either trials or space in its overall intensity and latency. Its utility is demonstrated on simulated data as well as actual EEG, and fMRI data. We show how shift-invariant multilinear decompositions of multiway data can successfully cope with variable latencies in data derived from neural activity--a problem that has caused degenerate solutions especially in modeling neuroimaging data with instantaneous multilinear decompositions. Our algorithm is available for download at www.erpwavelab.org.
AB - We present an algorithm for multilinear decomposition that allows for arbitrary shifts along one modality. The method is applied to neural activity arranged in the three modalities space, time, and trial. Thus, the algorithm models neural activity as a linear superposition of components with a fixed time course that may vary across either trials or space in its overall intensity and latency. Its utility is demonstrated on simulated data as well as actual EEG, and fMRI data. We show how shift-invariant multilinear decompositions of multiway data can successfully cope with variable latencies in data derived from neural activity--a problem that has caused degenerate solutions especially in modeling neuroimaging data with instantaneous multilinear decompositions. Our algorithm is available for download at www.erpwavelab.org.
KW - Algorithms
KW - Brain Mapping/methods
KW - Computer Simulation
KW - Electroencephalography/methods
KW - Evoked Potentials, Visual/physiology
KW - Image Enhancement/methods
KW - Image Interpretation, Computer-Assisted/methods
KW - Linear Models
KW - Magnetic Resonance Imaging/methods
KW - Models, Neurological
KW - Reproducibility of Results
KW - Sensitivity and Specificity
KW - Visual Cortex/physiology
U2 - 10.1016/j.neuroimage.2008.05.062
DO - 10.1016/j.neuroimage.2008.05.062
M3 - Journal article
C2 - 18625324
SN - 1053-8119
VL - 42
SP - 1439
EP - 1450
JO - NeuroImage
JF - NeuroImage
IS - 4
ER -